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<tr class="t-nv-h2"><td colspan="5"> Containers</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/span.html" title="cpp/header/span"><tt>&lt;span&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/array.html" title="cpp/header/array"><tt>&lt;array&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/vector.html" title="cpp/header/vector"><tt>&lt;vector&gt;</tt></a></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/deque.html" title="cpp/header/deque"><tt>&lt;deque&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/forward_list.html" title="cpp/header/forward list"><tt>&lt;forward_list&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/list.html" title="cpp/header/list"><tt>&lt;list&gt;</tt></a></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/map.html" title="cpp/header/map"><tt>&lt;map&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/set.html" title="cpp/header/set"><tt>&lt;set&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/queue.html" title="cpp/header/queue"><tt>&lt;queue&gt;</tt></a></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/unordered_map.html" title="cpp/header/unordered map"><tt>&lt;unordered_map&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/unordered_set.html" title="cpp/header/unordered set"><tt>&lt;unordered_set&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/stack.html" title="cpp/header/stack"><tt>&lt;stack&gt;</tt></a></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Iterators</td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/iterator.html" title="cpp/header/iterator"><tt>&lt;iterator&gt;</tt></a></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Ranges</td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/ranges.html" title="cpp/header/ranges"><tt>&lt;ranges&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Algorithms</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/algorithm.html" title="cpp/header/algorithm"><tt>&lt;algorithm&gt;</tt></a></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/execution.html" title="cpp/header/execution"><tt>&lt;execution&gt;</tt></a> <span class="t-mark-rev t-since-cxx17">(C++17)</span></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Numerics</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/complex.html" title="cpp/header/complex"><tt>&lt;complex&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/random.html" title="cpp/header/random"><tt>&lt;random&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/valarray.html" title="cpp/header/valarray"><tt>&lt;valarray&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/numeric.html" title="cpp/header/numeric"><tt>&lt;numeric&gt;</tt></a></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/bit.html" title="cpp/header/bit"><tt>&lt;bit&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/numbers.html" title="cpp/header/numbers"><tt>&lt;numbers&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/cfenv.html" title="cpp/header/cfenv"><tt>&lt;cfenv&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/cmath.html" title="cpp/header/cmath"><tt>&lt;cmath&gt;</tt></a></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Input/Output</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/iosfwd.html" title="cpp/header/iosfwd"><tt>&lt;iosfwd&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/ios.html" title="cpp/header/ios"><tt>&lt;ios&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/iomanip.html" title="cpp/header/iomanip"><tt>&lt;iomanip&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/streambuf.html" title="cpp/header/streambuf"><tt>&lt;streambuf&gt;</tt></a></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/istream.html" title="cpp/header/istream"><tt>&lt;istream&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/ostream.html" title="cpp/header/ostream"><tt>&lt;ostream&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/iostream.html" title="cpp/header/iostream"><tt>&lt;iostream&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <br>
</td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/syncstream.html" title="cpp/header/syncstream"><tt>&lt;syncstream&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/spanstream.html" title="cpp/header/spanstream"><tt>&lt;spanstream&gt;</tt></a> <span class="t-mark-rev t-since-cxx23">(C++23)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/sstream.html" title="cpp/header/sstream"><tt>&lt;sstream&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/fstream.html" title="cpp/header/fstream"><tt>&lt;fstream&gt;</tt></a></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/cstdio.html" title="cpp/header/cstdio"><tt>&lt;cstdio&gt;</tt></a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/cinttypes.html" title="cpp/header/cinttypes"><tt>&lt;cinttypes&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/strstream.html" title="cpp/header/strstream"><tt>&lt;strstream&gt;</tt></a> <span class="t-mark">(C++98/)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <br>
</td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Regular expressions</td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/regex.html" title="cpp/header/regex"><tt>&lt;regex&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Filesystem support</td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/filesystem.html" title="cpp/header/filesystem"><tt>&lt;filesystem&gt;</tt></a> <span class="t-mark-rev t-since-cxx17">(C++17)</span></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Thread support</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/thread.html" title="cpp/header/thread"><tt>&lt;thread&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/atomic.html" title="cpp/header/atomic"><tt>&lt;atomic&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/mutex.html" title="cpp/header/mutex"><tt>&lt;mutex&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/shared_mutex.html" title="cpp/header/shared mutex"><tt>&lt;shared_mutex&gt;</tt></a> <span class="t-mark-rev t-since-cxx14">(C++14)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/condition_variable.html" title="cpp/header/condition variable"><tt>&lt;condition_variable&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span>  </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/future.html" title="cpp/header/future"><tt>&lt;future&gt;</tt></a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/stop_token.html" title="cpp/header/stop token"><tt>&lt;stop_token&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/semaphore.html" title="cpp/header/semaphore"><tt>&lt;semaphore&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <br>
</td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/latch.html" title="cpp/header/latch"><tt>&lt;latch&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/barrier.html" title="cpp/header/barrier"><tt>&lt;barrier&gt;</tt></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <br>
</td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> C compatibility</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/cstdbool.html" title="cpp/header/cstdbool"><tt>&lt;cstdbool&gt;</tt></a> <span class="t-mark">(C++11/17/20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/ccomplex.html" title="cpp/header/ccomplex"><tt>&lt;ccomplex&gt;</tt></a> <span class="t-mark">(C++11/17/20)</span></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/ctgmath.html" title="cpp/header/ctgmath"><tt>&lt;ctgmath&gt;</tt></a> <span class="t-mark">(C++11/17/20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/cstdalign.html" title="cpp/header/cstdalign"><tt>&lt;cstdalign&gt;</tt></a> <span class="t-mark">(C++11/17/20)</span></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="header/ciso646.html" title="cpp/header/ciso646"><tt>&lt;ciso646&gt;</tt></a> <span class="t-mark-rev t-until-cxx20">(until C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="header/stdatomic.h.html" title="cpp/header/stdatomic.h"><tt>&lt;stdatomic.h&gt;</tt></a></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<p>The interface of C++ standard library is defined by the following collection of headers.
</p>
<table class="t-dsc-begin">


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Concepts_library">Concepts library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/concepts.html" title="cpp/header/concepts"> <span class="t-lines"><span>&lt;concepts&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="concepts.html" title="cpp/concepts">Fundamental library concepts</a> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Coroutines_library">Coroutines library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/coroutine.html" title="cpp/header/coroutine"> <span class="t-lines"><span>&lt;coroutine&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   <a href="coroutine.html" title="cpp/coroutine">Coroutine support library</a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/generator&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/generator (page does not exist)"> <span class="t-lines"><span>&lt;generator&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>   <span class="t-lc">std::generator</span> class template  </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Utilities_library">Utilities library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/any.html" title="cpp/header/any"> <span class="t-lines"><span>&lt;any&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="utility/any.html" title="cpp/utility/any">std::any</a></span> class </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/bitset.html" title="cpp/header/bitset"> <span class="t-lines"><span>&lt;bitset&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="utility/bitset.html" title="cpp/utility/bitset">std::bitset</a></span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/chrono.html" title="cpp/header/chrono"> <span class="t-lines"><span>&lt;chrono&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="chrono.html" title="cpp/chrono"> C++ time utilites</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/compare.html" title="cpp/header/compare"> <span class="t-lines"><span>&lt;compare&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="language/operator_comparison.html#Three-way_comparison" title="cpp/language/operator comparison">Three-way comparison operator</a> support </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/csetjmp.html" title="cpp/header/csetjmp"> <span class="t-lines"><span>&lt;csetjmp&gt;</span></span></a></div></div>
</td>
<td>  <a href="utility/program/setjmp.html" title="cpp/utility/program/setjmp"> Macro (and function) that saves (and jumps) to an execution context</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/csignal.html" title="cpp/header/csignal"> <span class="t-lines"><span>&lt;csignal&gt;</span></span></a></div></div>
</td>
<td>  <a href="utility/program.html" title="cpp/utility/program"> Functions and macro constants for signal management</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdarg.html" title="cpp/header/cstdarg"> <span class="t-lines"><span>&lt;cstdarg&gt;</span></span></a></div></div>
</td>
<td>  <a href="utility/variadic.html" title="cpp/utility/variadic"> Handling of variable length argument lists</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstddef.html" title="cpp/header/cstddef"> <span class="t-lines"><span>&lt;cstddef&gt;</span></span></a></div></div>
</td>
<td>  <a href="types.html" title="cpp/types"> Standard macros and typedefs</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdlib.html" title="cpp/header/cstdlib"> <span class="t-lines"><span>&lt;cstdlib&gt;</span></span></a></div></div>
</td>
<td>   General purpose utilities: <a href="utility/program.html" title="cpp/utility/program"> program control</a>, <a href="memory/c.html" title="cpp/memory/c"> dynamic memory allocation</a>, <a href="numeric/random.html#C_random_library" title="cpp/numeric/random"> random numbers</a>, <a href="algorithm.html#C_library" title="cpp/algorithm"> sort and search</a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ctime.html" title="cpp/header/ctime"> <span class="t-lines"><span>&lt;ctime&gt;</span></span></a></div></div>
</td>
<td>  <a href="chrono/c.html" title="cpp/chrono/c"> C-style time/date utilites</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/expected.html" title="cpp/header/expected"> <span class="t-lines"><span>&lt;expected&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>  <span class="t-lc">std::expected</span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/functional.html" title="cpp/header/functional"> <span class="t-lines"><span>&lt;functional&gt;</span></span></a></div></div>
</td>
<td>  <a href="utility/functional.html" title="cpp/utility/functional"> Function objects, Function invocations, Bind operations and Reference wrappers</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/initializer_list.html" title="cpp/header/initializer list"> <span class="t-lines"><span>&lt;initializer_list&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="utility/initializer_list.html" title="cpp/utility/initializer list">std::initializer_list</a></span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/optional.html" title="cpp/header/optional"> <span class="t-lines"><span>&lt;optional&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="utility/optional.html" title="cpp/utility/optional">std::optional</a></span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/source_location.html" title="cpp/header/source location"> <span class="t-lines"><span>&lt;source_location&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  Supplies means to obtain <a href="utility/source_location.html" title="cpp/utility/source location">source code location</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/tuple.html" title="cpp/header/tuple"> <span class="t-lines"><span>&lt;tuple&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="utility/tuple.html" title="cpp/utility/tuple">std::tuple</a></span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/type_traits.html" title="cpp/header/type traits"> <span class="t-lines"><span>&lt;type_traits&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="types.html" title="cpp/types">Compile-time type information</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/typeindex.html" title="cpp/header/typeindex"> <span class="t-lines"><span>&lt;typeindex&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="types/type_index.html" title="cpp/types/type index">std::type_index</a></span>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/typeinfo.html" title="cpp/header/typeinfo"> <span class="t-lines"><span>&lt;typeinfo&gt;</span></span></a></div></div>
</td>
<td>  <a href="types.html" title="cpp/types"> Runtime type information utilities</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/utility.html" title="cpp/header/utility"> <span class="t-lines"><span>&lt;utility&gt;</span></span></a></div></div>
</td>
<td>  Various <a href="utility.html" title="cpp/utility"> utility components</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/variant.html" title="cpp/header/variant"> <span class="t-lines"><span>&lt;variant&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="utility/variant.html" title="cpp/utility/variant">std::variant</a></span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/version.html" title="cpp/header/version"> <span class="t-lines"><span>&lt;version&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  Supplies implementation-dependent library information </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Dynamic_memory_management"> Dynamic memory management </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/memory.html" title="cpp/header/memory"> <span class="t-lines"><span>&lt;memory&gt;</span></span></a></div></div>
</td>
<td>  <a href="memory.html" title="cpp/memory">High-level memory management utilities</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/memory_resource.html" title="cpp/header/memory resource"> <span class="t-lines"><span>&lt;memory_resource&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  <a href="memory/memory_resource.html" title="cpp/memory/memory resource"> Polymorphic allocators and memory resources</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/new.html" title="cpp/header/new"> <span class="t-lines"><span>&lt;new&gt;</span></span></a></div></div>
</td>
<td>  <a href="memory/new.html" title="cpp/memory/new"> Low-level memory management utilities</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/scoped_allocator.html" title="cpp/header/scoped allocator"> <span class="t-lines"><span>&lt;scoped_allocator&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="memory/scoped_allocator_adaptor.html" title="cpp/memory/scoped allocator adaptor"> Nested allocator class</a> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Numeric_limits"> Numeric limits </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cfloat.html" title="cpp/header/cfloat"> <span class="t-lines"><span>&lt;cfloat&gt;</span></span></a></div></div>
</td>
<td>  <a href="types/climits.html" title="cpp/types/climits"> Limits of floating-point types</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cinttypes.html" title="cpp/header/cinttypes"> <span class="t-lines"><span>&lt;cinttypes&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>   <a href="types/integer.html#Format_macro_constants" title="cpp/types/integer"> Formatting macros</a>, <code>intmax_t</code> and <code>uintmax_t</code> math and conversions </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/climits.html" title="cpp/header/climits"> <span class="t-lines"><span>&lt;climits&gt;</span></span></a></div></div>
</td>
<td>  <a href="types/climits.html" title="cpp/types/climits"> Limits of integral types</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdint.html" title="cpp/header/cstdint"> <span class="t-lines"><span>&lt;cstdint&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="types/integer.html" title="cpp/types/integer"> Fixed-width integer types</a> and <a href="types/climits.html" title="cpp/types/climits"> limits of other types</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/limits.html" title="cpp/header/limits"> <span class="t-lines"><span>&lt;limits&gt;</span></span></a></div></div>
</td>
<td>   <a href="types/numeric_limits.html" title="cpp/types/numeric limits">Uniform way to query properties of arithmetic types</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/stdfloat&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/stdfloat (page does not exist)"> <span class="t-lines"><span>&lt;stdfloat&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>   Optional extended floating-point types  </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Error_handling"> Error handling </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cassert.html" title="cpp/header/cassert"> <span class="t-lines"><span>&lt;cassert&gt;</span></span></a></div></div>
</td>
<td>  <a href="error/assert.html" title="cpp/error/assert"> Conditionally compiled macro that compares its argument to zero</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cerrno.html" title="cpp/header/cerrno"> <span class="t-lines"><span>&lt;cerrno&gt;</span></span></a></div></div>
</td>
<td>  <a href="error/errno.html" title="cpp/error/errno"> Macro containing the last error number</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/exception.html" title="cpp/header/exception"> <span class="t-lines"><span>&lt;exception&gt;</span></span></a></div></div>
</td>
<td>  <a href="error.html#Exception_handling" title="cpp/error"> Exception handling utilities</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/stacktrace.html" title="cpp/header/stacktrace"> <span class="t-lines"><span>&lt;stacktrace&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>  <a href="utility/basic_stacktrace.html" title="cpp/utility/basic stacktrace">Stacktrace</a> library </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/stdexcept.html" title="cpp/header/stdexcept"> <span class="t-lines"><span>&lt;stdexcept&gt;</span></span></a></div></div>
</td>
<td>  <a href="error.html#Exception_categories" title="cpp/error"> Standard exception objects</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/system_error.html" title="cpp/header/system error"> <span class="t-lines"><span>&lt;system_error&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Defines <span class="t-lc"><a href="error/error_code.html" title="cpp/error/error code">std::error_code</a></span>, a platform-dependent error code </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Strings_library">Strings library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cctype.html" title="cpp/header/cctype"> <span class="t-lines"><span>&lt;cctype&gt;</span></span></a></div></div>
</td>
<td>  <a href="string/byte.html" title="cpp/string/byte"> Functions to determine the category of narrow characters</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/charconv.html" title="cpp/header/charconv"> <span class="t-lines"><span>&lt;charconv&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>   <span class="t-lc">std::to_chars</span> and <span class="t-lc">std::from_chars</span>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstring.html" title="cpp/header/cstring"> <span class="t-lines"><span>&lt;cstring&gt;</span></span></a></div></div>
</td>
<td>  Various <a href="string/byte.html" title="cpp/string/byte"> narrow character string handling functions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cuchar.html" title="cpp/header/cuchar"> <span class="t-lines"><span>&lt;cuchar&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  C-style <a href="string/multibyte.html" title="cpp/string/multibyte"> Unicode character conversion functions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cwchar.html" title="cpp/header/cwchar"> <span class="t-lines"><span>&lt;cwchar&gt;</span></span></a></div></div>
</td>
<td>  Various <a href="string/wide.html" title="cpp/string/wide">wide</a> and <a href="string/multibyte.html" title="cpp/string/multibyte">multibyte</a> string handling functions </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cwctype.html" title="cpp/header/cwctype"> <span class="t-lines"><span>&lt;cwctype&gt;</span></span></a></div></div>
</td>
<td>  <a href="string/wide.html" title="cpp/string/wide"> Functions to determine the catagory of wide characters</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/format.html" title="cpp/header/format"> <span class="t-lines"><span>&lt;format&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="utility/format.html" title="cpp/utility/format">Formatting library</a> including <span class="t-lc"><a href="utility/format/format.html" title="cpp/utility/format/format">std::format</a></span>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/string.html" title="cpp/header/string"> <span class="t-lines"><span>&lt;string&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/string_view.html" title="cpp/header/string view"> <span class="t-lines"><span>&lt;string_view&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> class template </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Containers_library">Containers library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/array.html" title="cpp/header/array"> <span class="t-lines"><span>&lt;array&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="container/array.html" title="cpp/container/array">std::array</a></span> container </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/deque.html" title="cpp/header/deque"> <span class="t-lines"><span>&lt;deque&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="container/deque.html" title="cpp/container/deque">std::deque</a></span> container </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/flat_map&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/flat map (page does not exist)"> <span class="t-lines"><span>&lt;flat_map&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>   <span class="t-lc">std::flat_map</span> and <span class="t-lc">std::flat_multimap</span> container adaptors  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/flat_set&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/flat set (page does not exist)"> <span class="t-lines"><span>&lt;flat_set&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>   <span class="t-lc">std::flat_set</span> and <span class="t-lc">std::flat_multiset</span> container adaptors  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/forward_list.html" title="cpp/header/forward list"> <span class="t-lines"><span>&lt;forward_list&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="container/forward_list.html" title="cpp/container/forward list">std::forward_list</a></span> container </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/list.html" title="cpp/header/list"> <span class="t-lines"><span>&lt;list&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="container/list.html" title="cpp/container/list">std::list</a></span> container </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/map.html" title="cpp/header/map"> <span class="t-lines"><span>&lt;map&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="container/map.html" title="cpp/container/map">std::map</a></span> and <span class="t-lc"><a href="container/multimap.html" title="cpp/container/multimap">std::multimap</a></span> associative containers </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/mdspan&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/mdspan (page does not exist)"> <span class="t-lines"><span>&lt;mdspan&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>   <span class="t-lc">std::mdspan</span> view  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/queue.html" title="cpp/header/queue"> <span class="t-lines"><span>&lt;queue&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="container/queue.html" title="cpp/container/queue">std::queue</a></span> and <span class="t-lc"><a href="container/priority_queue.html" title="cpp/container/priority queue">std::priority_queue</a></span> container adaptors </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/set.html" title="cpp/header/set"> <span class="t-lines"><span>&lt;set&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="container/set.html" title="cpp/container/set">std::set</a></span> and <span class="t-lc"><a href="container/multiset.html" title="cpp/container/multiset">std::multiset</a></span> associative containers </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/span.html" title="cpp/header/span"> <span class="t-lines"><span>&lt;span&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <span class="t-lc">std::span</span> view </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/stack.html" title="cpp/header/stack"> <span class="t-lines"><span>&lt;stack&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="container/stack.html" title="cpp/container/stack">std::stack</a></span> container adaptor  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/unordered_map.html" title="cpp/header/unordered map"> <span class="t-lines"><span>&lt;unordered_map&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="container/unordered_map.html" title="cpp/container/unordered map">std::unordered_map</a></span> and <span class="t-lc"><a href="container/unordered_multimap.html" title="cpp/container/unordered multimap">std::unordered_multimap</a></span> unordered associative containers </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/unordered_set.html" title="cpp/header/unordered set"> <span class="t-lines"><span>&lt;unordered_set&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="container/unordered_set.html" title="cpp/container/unordered set">std::unordered_set</a></span> and <span class="t-lc"><a href="container/unordered_multiset.html" title="cpp/container/unordered multiset">std::unordered_multiset</a></span> unordered associative containers </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/vector.html" title="cpp/header/vector"> <span class="t-lines"><span>&lt;vector&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="container/vector.html" title="cpp/container/vector">std::vector</a></span> container </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Iterators_library">Iterators library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/iterator.html" title="cpp/header/iterator"> <span class="t-lines"><span>&lt;iterator&gt;</span></span></a></div></div>
</td>
<td>  <a href="iterator.html" title="cpp/iterator"> Range iterators</a> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Ranges_library">Ranges library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ranges.html" title="cpp/header/ranges"> <span class="t-lines"><span>&lt;ranges&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="ranges.html" title="cpp/ranges"> Range access, primitives, requirements, utilities and adaptors</a> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Algorithms_library">Algorithms library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/algorithm.html" title="cpp/header/algorithm"> <span class="t-lines"><span>&lt;algorithm&gt;</span></span></a></div></div>
</td>
<td>  <a href="algorithm.html" title="cpp/algorithm"> Algorithms that operate on ranges</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/execution.html" title="cpp/header/execution"> <span class="t-lines"><span>&lt;execution&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  Predefined execution policies for parallel versions of the algorithms </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Numerics_library">Numerics library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/bit.html" title="cpp/header/bit"> <span class="t-lines"><span>&lt;bit&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="numeric.html#Bit_manipulation_.28since_C.2B.2B20.29" title="cpp/numeric"> Bit manipulation</a> functions </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cfenv.html" title="cpp/header/cfenv"> <span class="t-lines"><span>&lt;cfenv&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="numeric/fenv.html" title="cpp/numeric/fenv"> Floating-point environment</a> access functions </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cmath.html" title="cpp/header/cmath"> <span class="t-lines"><span>&lt;cmath&gt;</span></span></a></div></div>
</td>
<td>  <a href="numeric/math.html" title="cpp/numeric/math"> Common mathematics functions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/complex.html" title="cpp/header/complex"> <span class="t-lines"><span>&lt;complex&gt;</span></span></a></div></div>
</td>
<td>  <a href="numeric/complex.html" title="cpp/numeric/complex"> Complex number type</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/numbers.html" title="cpp/header/numbers"> <span class="t-lines"><span>&lt;numbers&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="numeric/constants.html" title="cpp/numeric/constants"> Math constants</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/numeric.html" title="cpp/header/numeric"> <span class="t-lines"><span>&lt;numeric&gt;</span></span></a></div></div>
</td>
<td>  <a href="numeric.html" title="cpp/numeric"> Numeric operations on values in ranges</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/random.html" title="cpp/header/random"> <span class="t-lines"><span>&lt;random&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="numeric/random.html" title="cpp/numeric/random"> Random number generators and distributions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ratio.html" title="cpp/header/ratio"> <span class="t-lines"><span>&lt;ratio&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="numeric/ratio.html" title="cpp/numeric/ratio"> Compile-time rational arithmetic</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/valarray.html" title="cpp/header/valarray"> <span class="t-lines"><span>&lt;valarray&gt;</span></span></a></div></div>
</td>
<td>  <a href="numeric/valarray.html" title="cpp/numeric/valarray"> Class for representing and manipulating arrays of values</a> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Localization_library">Localization library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/clocale.html" title="cpp/header/clocale"> <span class="t-lines"><span>&lt;clocale&gt;</span></span></a></div></div>
</td>
<td>  <a href="locale.html#C_library_locales" title="cpp/locale"> C localization utilities</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/codecvt.html" title="cpp/header/codecvt"> <span class="t-lines"><span>&lt;codecvt&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-deprecated-cxx17">(deprecated in C++17)</span></span></span></div></div>
</td>
<td>  <a href="locale.html" title="cpp/locale"> Unicode conversion facilities</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/locale.html" title="cpp/header/locale"> <span class="t-lines"><span>&lt;locale&gt;</span></span></a></div></div>
</td>
<td>  <a href="locale.html" title="cpp/locale"> Localization utilities</a> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Input.2Foutput_library">Input/output library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdio.html" title="cpp/header/cstdio"> <span class="t-lines"><span>&lt;cstdio&gt;</span></span></a></div></div>
</td>
<td>  <a href="io/c.html" title="cpp/io/c"> C-style input-output functions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/fstream.html" title="cpp/header/fstream"> <span class="t-lines"><span>&lt;fstream&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="io/basic_fstream.html" title="cpp/io/basic fstream">std::basic_fstream</a></span>, <span class="t-lc"><a href="io/basic_ifstream.html" title="cpp/io/basic ifstream">std::basic_ifstream</a></span>, <span class="t-lc"><a href="io/basic_ofstream.html" title="cpp/io/basic ofstream">std::basic_ofstream</a></span> class templates and several typedefs </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/iomanip.html" title="cpp/header/iomanip"> <span class="t-lines"><span>&lt;iomanip&gt;</span></span></a></div></div>
</td>
<td>  <a href="io/manip.html" title="cpp/io/manip"> Helper functions to control the format of input and output</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ios.html" title="cpp/header/ios"> <span class="t-lines"><span>&lt;ios&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="io/ios_base.html" title="cpp/io/ios base">std::ios_base</a></span> class, <span class="t-lc"><a href="io/basic_ios.html" title="cpp/io/basic ios">std::basic_ios</a></span> class template and several typedefs </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/iosfwd.html" title="cpp/header/iosfwd"> <span class="t-lines"><span>&lt;iosfwd&gt;</span></span></a></div></div>
</td>
<td>  Forward declarations of all classes in the input/output library </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/iostream.html" title="cpp/header/iostream"> <span class="t-lines"><span>&lt;iostream&gt;</span></span></a></div></div>
</td>
<td>  Several standard stream objects </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/istream.html" title="cpp/header/istream"> <span class="t-lines"><span>&lt;istream&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="io/basic_istream.html" title="cpp/io/basic istream">std::basic_istream</a></span> class template and several typedefs </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ostream.html" title="cpp/header/ostream"> <span class="t-lines"><span>&lt;ostream&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="io/basic_ostream.html" title="cpp/io/basic ostream">std::basic_ostream</a></span>, <span class="t-lc"><a href="io/basic_iostream.html" title="cpp/io/basic iostream">std::basic_iostream</a></span> class templates and several typedefs </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/print&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/print (page does not exist)"> <span class="t-lines"><span>&lt;print&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>   Formatted output library including <span class="t-lc">std::print</span>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/spanstream.html" title="cpp/header/spanstream"> <span class="t-lines"><span>&lt;spanstream&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>  <span class="t-lc">std::basic_spanstream</span>, <span class="t-lc">std::basic_ispanstream</span>, <span class="t-lc">std::basic_ospanstream</span> class templates and typedefs </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/sstream.html" title="cpp/header/sstream"> <span class="t-lines"><span>&lt;sstream&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="io/basic_stringstream.html" title="cpp/io/basic stringstream">std::basic_stringstream</a></span>, <span class="t-lc"><a href="io/basic_istringstream.html" title="cpp/io/basic istringstream">std::basic_istringstream</a></span>, <span class="t-lc"><a href="io/basic_ostringstream.html" title="cpp/io/basic ostringstream">std::basic_ostringstream</a></span> class templates and several typedefs </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/streambuf.html" title="cpp/header/streambuf"> <span class="t-lines"><span>&lt;streambuf&gt;</span></span></a></div></div>
</td>
<td>  <span class="t-lc"><a href="io/basic_streambuf.html" title="cpp/io/basic streambuf">std::basic_streambuf</a></span> class template </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/strstream.html" title="cpp/header/strstream"> <span class="t-lines"><span>&lt;strstream&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="io/strstream.html" title="cpp/io/strstream">std::strstream</a></span>, <span class="t-lc"><a href="io/istrstream.html" title="cpp/io/istrstream">std::istrstream</a></span>, <span class="t-lc"><a href="io/ostrstream.html" title="cpp/io/ostrstream">std::ostrstream</a></span>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/syncstream.html" title="cpp/header/syncstream"> <span class="t-lines"><span>&lt;syncstream&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <span class="t-lc">std::basic_osyncstream</span>, <span class="t-lc">std::basic_syncbuf</span>, and typedefs </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Filesystem_library">Filesystem library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/filesystem.html" title="cpp/header/filesystem"> <span class="t-lines"><span>&lt;filesystem&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  <span class="t-lc">std::path</span> class and <a href="filesystem.html" title="cpp/filesystem"> supporting functions</a>  </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Regular_Expressions_library">Regular Expressions library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/regex.html" title="cpp/header/regex"> <span class="t-lines"><span>&lt;regex&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="regex.html" title="cpp/regex"> Classes, algorithms and iterators to support regular expression processing</a> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Atomic_Operations_library">Atomic Operations library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/atomic.html" title="cpp/header/atomic"> <span class="t-lines"><span>&lt;atomic&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="thread.html#Atomic_operations" title="cpp/thread"> Atomic operations library</a> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id="Thread_support_library">Thread support library</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/barrier.html" title="cpp/header/barrier"> <span class="t-lines"><span>&lt;barrier&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="thread/barrier.html" title="cpp/thread/barrier">Barriers</a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/condition_variable.html" title="cpp/header/condition variable"> <span class="t-lines"><span>&lt;condition_variable&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="thread.html" title="cpp/thread">Thread waiting conditions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/future.html" title="cpp/header/future"> <span class="t-lines"><span>&lt;future&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="thread.html" title="cpp/thread"> Primitives for asynchronous computations</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/latch.html" title="cpp/header/latch"> <span class="t-lines"><span>&lt;latch&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="thread/latch.html" title="cpp/thread/latch">Latches</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/mutex.html" title="cpp/header/mutex"> <span class="t-lines"><span>&lt;mutex&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <a href="thread.html" title="cpp/thread">Mutual exclusion primitives</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/semaphore.html" title="cpp/header/semaphore"> <span class="t-lines"><span>&lt;semaphore&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  <a href="thread/counting_semaphore.html" title="cpp/thread/counting semaphore">Semaphores</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/shared_mutex.html" title="cpp/header/shared mutex"> <span class="t-lines"><span>&lt;shared_mutex&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td>  <a href="thread.html" title="cpp/thread"> Shared mutual exclusion primitives</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/stop_token.html" title="cpp/header/stop token"> <span class="t-lines"><span>&lt;stop_token&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  Stop tokens for <span class="t-lc"><a href="thread/jthread.html" title="cpp/thread/jthread">std::jthread</a></span>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/thread.html" title="cpp/header/thread"> <span class="t-lines"><span>&lt;thread&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  <span class="t-lc"><a href="thread/thread.html" title="cpp/thread/thread">std::thread</a></span> class and <a href="thread.html" title="cpp/thread"> supporting functions</a> </td></tr>
</table>
<h3><span class="mw-headline" id="C_compatibility_headers">C compatibility headers</span></h3>
<p>For some of the C standard library headers of the form <code><i>xxx</i>.h</code>, the C++ standard library both includes an identically-named header and another header of the form <code>c<i>xxx</i></code> (all meaningful <code>c<i>xxx</i></code> headers are listed above). The intended use of headers of form <code><i>xxx</i>.h</code> is for interoperability only. It is possible that C++ source files need to include one of these headers in order to be valid ISO C. Source files that are not intended to also be valid ISO C should not use any of the C headers.
</p><p>With the exception of <a href="header/ccomplex.html" title="cpp/header/ccomplex"><code>complex.h</code></a> , each <code><i>xxx</i>.h</code> header included in the C++ standard library places in the global namespace each name that the corresponding <code>c<i>xxx</i></code> header would have placed in the <span class="t-c"><span class="mw-geshi cpp source-cpp">std</span></span> namespace.
</p><p>These headers are allowed to also declare the same names in the <span class="t-c"><span class="mw-geshi cpp source-cpp">std</span></span> namespace, and the corresponding <code>c<i>xxx</i></code> headers are allowed to also declare the same names in the global namespace: including <a href="header/cstdlib.html" title="cpp/header/cstdlib"><tt>&lt;cstdlib&gt;</tt></a> definitely provides <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="memory/c/malloc.html"><span class="kw760">std::<span class="me2">malloc</span></span></a></span></span> and may also provide <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy4">::</span><span class="me2">malloc</span></span></span>. Including <code>&lt;stdlib.h&gt;</code> definitely provides <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy4">::</span><span class="me2">malloc</span></span></span> and may also provide <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="memory/c/malloc.html"><span class="kw760">std::<span class="me2">malloc</span></span></a></span></span>. This applies even to functions and function overloads that are not part of C standard library.
</p><p>Notes: <code><i>xxx</i>.h</code> headers are deprecated in C++98 and undeprecated in C++23. These headers are discouraged for pure C++ code, but not subject to future removal.
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cassert.html" title="cpp/header/cassert"> <span class="t-lines"><span>&lt;assert.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves same as <a href="header/cassert.html" title="cpp/header/cassert"><tt>&lt;cassert&gt;</tt></a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cctype.html" title="cpp/header/cctype"> <span class="t-lines"><span>&lt;ctype.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cctype.html" title="cpp/header/cctype"><tt>&lt;cctype&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cerrno.html" title="cpp/header/cerrno"> <span class="t-lines"><span>&lt;errno.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves same as <a href="header/cerrno.html" title="cpp/header/cerrno"><tt>&lt;cerrno&gt;</tt></a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cfenv.html" title="cpp/header/cfenv"> <span class="t-lines"><span>&lt;fenv.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cfenv.html" title="cpp/header/cfenv"><tt>&lt;cfenv&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cfloat.html" title="cpp/header/cfloat"> <span class="t-lines"><span>&lt;float.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves same as <a href="header/cfloat.html" title="cpp/header/cfloat"><tt>&lt;cfloat&gt;</tt></a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cinttypes.html" title="cpp/header/cinttypes"> <span class="t-lines"><span>&lt;inttypes.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cinttypes.html" title="cpp/header/cinttypes"><tt>&lt;cinttypes&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/climits.html" title="cpp/header/climits"> <span class="t-lines"><span>&lt;limits.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves same as <a href="header/climits.html" title="cpp/header/climits"><tt>&lt;climits&gt;</tt></a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/clocale.html" title="cpp/header/clocale"> <span class="t-lines"><span>&lt;locale.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/clocale.html" title="cpp/header/clocale"><tt>&lt;clocale&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cmath.html" title="cpp/header/cmath"> <span class="t-lines"><span>&lt;math.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cmath.html" title="cpp/header/cmath"><tt>&lt;cmath&gt;</tt></a> is placed in global namespace,<br>except for names of <a href="numeric/special_functions.html" title="cpp/numeric/special functions">mathematical special functions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/csetjmp.html" title="cpp/header/csetjmp"> <span class="t-lines"><span>&lt;setjmp.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/csetjmp.html" title="cpp/header/csetjmp"><tt>&lt;csetjmp&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/csignal.html" title="cpp/header/csignal"> <span class="t-lines"><span>&lt;signal.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/csignal.html" title="cpp/header/csignal"><tt>&lt;csignal&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdarg.html" title="cpp/header/cstdarg"> <span class="t-lines"><span>&lt;stdarg.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cstdarg.html" title="cpp/header/cstdarg"><tt>&lt;cstdarg&gt;</tt></a> is placed in global namespace  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstddef.html" title="cpp/header/cstddef"> <span class="t-lines"><span>&lt;stddef.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cstddef.html" title="cpp/header/cstddef"><tt>&lt;cstddef&gt;</tt></a> is placed in global namespace,<br>except for names of <a href="types/byte.html" title="cpp/types/byte"><code>std::byte</code> and related functions</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdint.html" title="cpp/header/cstdint"> <span class="t-lines"><span>&lt;stdint.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cstdint.html" title="cpp/header/cstdint"><tt>&lt;cstdint&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdio.html" title="cpp/header/cstdio"> <span class="t-lines"><span>&lt;stdio.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cstdio.html" title="cpp/header/cstdio"><tt>&lt;cstdio&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdlib.html" title="cpp/header/cstdlib"> <span class="t-lines"><span>&lt;stdlib.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cstdlib.html" title="cpp/header/cstdlib"><tt>&lt;cstdlib&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstring.html" title="cpp/header/cstring"> <span class="t-lines"><span>&lt;string.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cstring.html" title="cpp/header/cstring"><tt>&lt;cstring&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ctime.html" title="cpp/header/ctime"> <span class="t-lines"><span>&lt;time.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/ctime.html" title="cpp/header/ctime"><tt>&lt;ctime&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cuchar.html" title="cpp/header/cuchar"> <span class="t-lines"><span>&lt;uchar.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cuchar.html" title="cpp/header/cuchar"><tt>&lt;cuchar&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cwchar.html" title="cpp/header/cwchar"> <span class="t-lines"><span>&lt;wchar.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cwchar.html" title="cpp/header/cwchar"><tt>&lt;cwchar&gt;</tt></a> is placed in global namespace </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cwctype.html" title="cpp/header/cwctype"> <span class="t-lines"><span>&lt;wctype.h&gt;</span></span></a></div></div>
</td>
<td>  Behaves as if each name from <a href="header/cwctype.html" title="cpp/header/cwctype"><tt>&lt;cwctype&gt;</tt></a> is placed in global namespace </td></tr>
</table>
<h4><span class="mw-headline" id="Special_C_compatibility_headers">Special C compatibility headers</span></h4>
<p>The header <code>&lt;stdatomic.h&gt;</code> declares names which are also provided in the C standard library, and defines the <code>_Atomic</code> macro which is a <a href="../c/keyword/_Atomic.html" title="c/keyword/ Atomic">keyword</a> in C. Unlike other <code><i>xxx</i>.h</code> headers, corresponding <code>&lt;cstdatomic&gt;</code> is not provided.
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/stdatomic.h.html" title="cpp/header/stdatomic.h"> <span class="t-lines"><span>&lt;stdatomic.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div>
</td>
<td>  Defines <code>_Atomic</code> and provides corresponding components in the C standard library </td></tr>
</table>
<h4><span class="mw-headline" id="Empty_C_headers">Empty C headers</span></h4>
<p>The headers <code>&lt;complex.h&gt;</code>, <a href="header/ccomplex.html" title="cpp/header/ccomplex"><tt>&lt;ccomplex&gt;</tt></a>, <code>&lt;tgmath.h&gt;</code>, and <a href="header/ctgmath.html" title="cpp/header/ctgmath"><tt>&lt;ctgmath&gt;</tt></a> do not contain any content from the C standard library and instead merely include other headers from the C++ standard library.
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ccomplex.html" title="cpp/header/ccomplex"> <span class="t-lines"><span>&lt;ccomplex&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-deprecated-cxx17">(deprecated in C++17)</span><span class="t-mark-rev t-until-cxx20">(removed in C++20)</span></span></span></div></div>
</td>
<td>  Simply includes the header <a href="header/complex.html" title="cpp/header/complex"><tt>&lt;complex&gt;</tt></a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ccomplex.html" title="cpp/header/ccomplex"> <span class="t-lines"><span>&lt;complex.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Simply includes the header <a href="header/complex.html" title="cpp/header/complex"><tt>&lt;complex&gt;</tt></a>  </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ctgmath.html" title="cpp/header/ctgmath"> <span class="t-lines"><span>&lt;ctgmath&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-deprecated-cxx17">(deprecated in C++17)</span><span class="t-mark-rev t-until-cxx20">(removed in C++20)</span></span></span></div></div>
</td>
<td>  Simply includes the headers <a href="header/complex.html" title="cpp/header/complex"><tt>&lt;complex&gt;</tt></a> and <a href="header/cmath.html" title="cpp/header/cmath"><tt>&lt;cmath&gt;</tt></a>: the overloads equivalent to the contents of the C header <code>tgmath.h</code> are already provided by those headers </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ctgmath.html" title="cpp/header/ctgmath"> <span class="t-lines"><span>&lt;tgmath.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Simply includes the headers <a href="header/complex.html" title="cpp/header/complex"><tt>&lt;complex&gt;</tt></a> and <a href="header/cmath.html" title="cpp/header/cmath"><tt>&lt;cmath&gt;</tt></a>   </td></tr>
</table>
<h4><span class="mw-headline" id="Meaningless_C_headers">Meaningless C headers</span></h4>
<p>The headers <a href="header/ciso646.html" title="cpp/header/ciso646"><tt>&lt;ciso646&gt;</tt></a>, <a href="header/cstdalign.html" title="cpp/header/cstdalign"><tt>&lt;cstdalign&gt;</tt></a>, and <a href="header/cstdbool.html" title="cpp/header/cstdbool"><tt>&lt;cstdbool&gt;</tt></a> are meaningless in C++ because the macros they provide in C are language keywords in C++.
</p>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ciso646.html" title="cpp/header/ciso646"> <span class="t-lines"><span>&lt;ciso646&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx20">(removed in C++20)</span></span></span></div></div>
</td>
<td>  Empty header. <a href="../c/language/operator_alternative.html" title="c/language/operator alternative">The macros that appear in <code>iso646.h</code> in C</a> are <a href="language/operator_alternative.html" title="cpp/language/operator alternative">keywords in C++</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdalign.html" title="cpp/header/cstdalign"> <span class="t-lines"><span>&lt;cstdalign&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-deprecated-cxx17">(deprecated in C++17)</span><span class="t-mark-rev t-until-cxx20">(removed in C++20)</span></span></span></div></div>
</td>
<td>  Defines one <a href="types.html" title="cpp/types">compatibility macro constant</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdbool.html" title="cpp/header/cstdbool"> <span class="t-lines"><span>&lt;cstdbool&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-deprecated-cxx17">(deprecated in C++17)</span><span class="t-mark-rev t-until-cxx20">(removed in C++20)</span></span></span></div></div>
</td>
<td>  Defines one <a href="types.html" title="cpp/types">compatibility macro constant</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/ciso646.html" title="cpp/header/ciso646"> <span class="t-lines"><span>&lt;iso646.h&gt;</span></span></a></div></div>
</td>
<td>  Has no effect </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdalign.html" title="cpp/header/cstdalign"> <span class="t-lines"><span>&lt;stdalign.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Defines one <a href="types.html" title="cpp/types">compatibility macro constant</a> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="header/cstdbool.html" title="cpp/header/cstdbool"> <span class="t-lines"><span>&lt;stdbool.h&gt;</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  Defines one <a href="types.html" title="cpp/types">compatibility macro constant </a> </td></tr>
</table>
<h4><span class="mw-headline" id="Unsupported_C_headers">Unsupported C headers</span></h4>
<p>The C headers <span class="t-rev-inl t-until-cxx23"><span><code>&lt;stdatomic.h&gt;</code>,</span> <span><span class="t-mark-rev t-until-cxx23">(until C++23)</span></span></span> <code>&lt;stdnoreturn.h&gt;</code>, and <code>&lt;threads.h&gt;</code> are not included in C++ and have no <code>c<i>xxx</i></code> equivalents.
</p>
<h3><span class="mw-headline" id="Experimental_libraries"><a href="header/experimental.html" title="cpp/header/experimental">Experimental libraries</a></span></h3>
<p><a href="experimental.html" title="cpp/experimental">C++ TR's/TS's</a> also define several collections of headers.
</p>
<h3><span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">

</table>

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